JPH0738400Y2 - Shrub board device - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is provided in a working machine such as a hydraulic excavator,
The present invention relates to an earth discharging plate device used to remove excavated earth and sand.

[Conventional technology]

As prior art, FIGS. 3 to 5 show an earth excavator plate device for a hydraulic excavator. In the figure, reference numeral 1 denotes a hydraulic excavator, which is a lower traveling body 2 having a track frame 2A and a crawler belt 2B, an upper revolving body 3 rotatably mounted on the lower traveling body 2, and an upper revolving body. The excavator device 4 provided on the body 3 is generally configured.

Reference numeral 5 denotes an earth-discharging plate device provided on the hydraulic excavator 1 for performing earth-discharging work. Reference numeral 6 denotes an earth-discharging plate that constitutes the earth-discharging plate device 5, and the earth-discharging plate 6 is a horizontally long rectangular steel plate having a concave curved front surface as an earth-discharging surface 6A and another rear surface as an attaching surface 6B. It consists of Reference numerals 7 and 8 denote upper and lower reinforcing plates arranged along the longitudinal direction on the mounting surface 6B of the soil discharging plate 6 and fixed by welding means. The upper reinforcing plate 7 has a substantially V-shaped cross section. Made of scale material, the lower reinforcing plate 8 has upper and lower surfaces 8A, 8B and side surfaces 8C.
It is made of a long material having a substantially U-shaped cross section.

Reference numerals 9 and 9 denote a pair of stays for swingably supporting the soil discharge plate 6 with respect to the hydraulic excavator 1. One end side 9A of each stay 9 is welded to a side surface 8C of the lower reinforcing plate 8. They are more firmly fixed and protrude from the lower reinforcing plate 8 in a state of being separated from each other by a predetermined distance and parallel to each other. The other end 9B of each stay 9 is connected to a stay mounting bracket 10, 10 fixed to the track frame 2A via a support pin 11. A pair of stays 9 and 9 are located near the soil discharging plate 6.
The both ends are welded to a cylinder supporting member, and the cylinder supporting member 12 is a hollow cylindrical body.

Reference numeral 13 is a lifting cylinder for lifting the soil discharge plate 6, and the lifting cylinder 13 is a tube 13A and a tube 13A.
It has a piston rod 13B which projects from and can be moved back and forth. 14 and 14 are the lift cylinders 13 and the earth plate 6
A pair of cylinder mounting brackets for connecting to
The pair of cylinder mounting brackets 14 and 14 are located in the middle of the cylinder supporting member 12 in the axial direction, and are fixed to the outer peripheral surface by means such as welding, and the tube 13 via the connecting pin 15.
It is linked to A. On the other hand, on the track frame 2A, a pair of rod mounting brackets 16 and 16 are fixed to the side of the stay mounting bracket 10, and the rod mounting brackets 16 and 16 are connected to the piston rod 1 via a connecting pin 17.
3B is connected.

The conventional soil discharging plate device 5 is configured as described above,
When the piston rod 13B of the lifting cylinder 13 contracts, each stay 9 rotates upward with the support pin 11 as a fulcrum, and when the piston rod 13B extends, each stay 9 rotates downward with the support pin 11 as a fulcrum. The earth-discharging plate 6 fixed to one end 9A of the 9, 9 can be moved up and down in FIG.

[Problems to be solved by the device]

Thus, according to the above-mentioned earth discharging plate device 5, as shown in FIG. 5, when one side load from the arrow A direction acts on one end portion in the longitudinal direction of the earth discharging plate 6, they are parallel to each other. As a result of the twisting force acting on the pair of stays 9, a high twisting stress and a bending stress are generated at both axial ends of the cylinder support member 12 fixed to each stay 9. Further, a pair of cylinder mounting brackets 14, 1 whose one end is fixed to the cylinder support member 12 and the other end side is fitted with the connecting pin 15 to be parallel to each other.
In the cylinder 4, torsional stress and the like are generated along with the generation of the torsional stress and the bending stress in the cylinder support member 12.

Therefore, in order to prevent deformation of the cylinder support member 12 and the cylinder mounting brackets 14 and 14 due to torsional stress and bending stress, the plate thickness of these members should be increased, reinforcing ribs should be provided, or welded parts should be thickened. However, there is a drawback in that the manufacturing cost and the weight are increased, and accordingly, the lifting cylinder has to be large in size.

As another conventional technique, as shown in FIGS. 6 and 7, the cylinder mounting brackets 14 ', 14' are attached to the lower reinforcing plate 8.
It is known to be directly welded to the side surface 8C of the.

Thus, according to this conventional technique, the cylinder support member 12 of the prior art can be dispensed with, but the hydraulic pressure of the lifting cylinder 13 is directly applied to the lower reinforcing plate 8 and the drainage work is performed. Since there is a problem that the lower reinforcing plate 8 is deformed by the impact force applied to the soil plate 6, it is necessary to set the plate thickness of the reinforcing plate 8 to be large, and there is a drawback that the increase in weight cannot be avoided. is there.

Further, in any of the above-mentioned conventional techniques, the lower reinforcing plate 8
Since it consists of one long material with the same length as the overall length of the soil discharge plate 6, a large press machine is required and it is difficult to position it on the rear surface 6B of the soil discharge plate 6 because it is easily twisted. Therefore, there is a problem that workability is impaired.

The present invention has been made in view of the above-mentioned drawbacks of the related arts, and it is possible to prevent the generation of torsional stress and bending stress in a member, and to improve the strength, reduce the weight, and reduce the manufacturing man-hours. A soil dumping plate device is provided.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the structure of the earth-discharging plate adopted by the present invention is such that the work machine main body is mounted via the left and right stays,
An earth-discharging plate which is provided so as to be able to move up and down and has a front surface serving as an earth-discharging surface, a reinforcing plate fixed to the rear surface of the earth-discharging plate along the longitudinal direction, and the earth-discharging plate through a pair of mounting brackets. An elevating cylinder arranged between the earth plate and the working machine body, each mounting bracket of the elevating cylinder is directly fixed to the rear surface of the earth discharging plate, and the reinforcing plate is provided between the mounting brackets. 3 of a central reinforcing member arranged on the left side and a pair of outer reinforcing members arranged on the left and right sides of the respective mounting brackets.
The reinforcing member is divided into members, the reinforcing members are integrally fixed to the rear surface of the earth discharging plate with the mounting brackets, and the left and right stays are fixed to the left and right outer reinforcing members, respectively.

[Action]

With the above structure, the hydraulic pressure of the lifting cylinder is directly transmitted to the earth discharging plate via each mounting bracket, and the impact force applied to the earth discharging plate is transmitted to the lifting cylinder side via each mounting bracket. As a result, deformation of the reinforcing plate due to torsional stress and bending stress is prevented, and the durability of the reinforcing plate is improved. Further, by dividing the reinforcing plate into three members, that is, the central reinforcing member and the pair of outer reinforcing members, it becomes possible to manufacture the reinforcing plate with high dimensional accuracy by easy press working, so that the processing cost can be reduced. The productivity is improved by improving the assemblability by reducing the cost and increasing the dimensional accuracy.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. The same components as those of the conventional technique described above are designated by the same reference numerals, and the description thereof will be omitted.

However, in the figure, 21 is a lifting cylinder in which the tube 21A and the piston rod 21B extending from the tube 21A are set to be longer than those of the prior art, and 22 and 22 are the soiling plates for the lifting cylinder 21. A pair of cylinder mounting brackets for connecting to the 6 side, each of the mounting brackets 22 being in contact with the rear surface 6B of the earth-draining plate 6 almost entirely in the longitudinal direction, and a pin insertion fitting. It has a hole 22B. The cylinder mounting brackets 22 are in contact with the rear surface 6B of the soil discharging plate 6.
The tube 21A of the ascending / descending cylinder 21 is connected via a connecting pin 15 inserted into the pin insertion hole 22B, which is fixed by welding means in a state where the 22A is directly abutted.

Reference numeral 23 denotes a reinforcing plate provided on the earth discharging plate 6 in place of the lower reinforcing plate 8 according to the prior art. The reinforcing plate 23 is a central reinforcing member 24 arranged between the pair of cylinder mounting brackets 22, 22. The reinforcing member 24 is formed to be longer than the reinforcing member 24, and is divided into three members, a pair of outer reinforcing members 25 and 26 arranged on the left and right sides of the mounting brackets 22, respectively. 26 is the upper surface 24A,
25A, 26A, lower surfaces 24B, 25B, 26B and side surfaces 24C, 25C, 26C are formed in a member having a substantially U-shaped cross section.

The central reinforcing member 24 among the above-mentioned three reinforcing members 24, 25, 26 is located between the cylinder mounting brackets 22, 22 and is integrally formed on the rear surface 6B of the earth discharging plate 6 and both ends of each mounting bracket 22. It is welded. On the other hand, the outer reinforcing members 25 and 26 are located laterally outside of the mounting brackets 22 and 22 and are located on the rear surface 6 of the earth discharging plate 6.
It is welded to B along the longitudinal direction, and the contact portion with each mounting bracket 22 is also welded.

Further, similarly to the one shown as one prior art, one end side 9A of the left and right stays 9 and 9 is fixed to the outer surfaces of the left and right outer reinforcing members 25 and 26 by welding means and is separated by a predetermined distance. Project in parallel with each other. It should be noted that each of the mounting brackets 22, the central reinforcing member 24, the left and right outer reinforcing members are attached to the earth discharging plate 6.
After welding 25 and 26, one end side 9A of the left and right stays 9 and 9 is welded to the left and right outer reinforcing members 25 and 26, which facilitates the welding work.

The embodiment is configured as described above, and the lifting cylinder 21
There is no difference from the prior art in the action of elevating and lowering the soil discharge plate 6 by expanding and contracting to remove dirt and the like. However, according to the embodiment, the cylinder mounting brackets 22 and 22 have the respective contact surfaces 22A directly fixed to the rear surface 6B of the soil discharging plate 6, so that the hydraulic pressure of the lifting cylinder 21 does not go through the reinforcing plate 23. It can be directly transmitted to the soil discharging plate 6, and the impact applied to the soil discharging plate 6 during the soil discharging work can be transmitted to the lifting cylinder 21 side via the cylinder mounting brackets 22 and 22, and the connecting pin 15, and the reinforcing plate 23 is constructed so as not to directly receive the impact, and the cylinder support member 12 of the prior art is not required.

Thus, according to the embodiment, even when a single load is applied to the longitudinal end portion of the soil discharge plate 6, the problem of the occurrence of torsional stress in both end portions of the cylinder support member 12 and the cylinder mounting brackets 14, 14 is solved. it can. In addition, the cylinder support member 12
As a result, the welding thickness can be reduced, the welding thickness can be reduced, and the reinforcing ribs can be eliminated. Therefore, the material cost and the man-hour can be reduced, and the cost of the cylinder support member 12 itself can be reduced. .

Further, according to the embodiment, unlike the lower reinforcing plate 8 in the other prior art, the reinforcing plate 23 is configured so as not to be directly subjected to hydraulic pressure or impact, and the strength of the reinforcing plate 23 is impaired. Since it is not necessary to use a thick steel plate for the reinforcing plate 23, the cost can be reduced and the durability of the soil discharging plate 6 can be improved.

Furthermore, the reinforcing plate 23 is composed of a central reinforcing member 24 and a pair of outer reinforcing members 25 and 26.
Since the length dimension is shorter than
The press working of 24, 25, 26 is easy, and the dimensional accuracy can be improved. Further, the central reinforcing member 24 that constitutes the reinforcing plate 23 includes the earth discharging plate 6 and the pair of cylinder mounting brackets 2.
It is integrally welded to 2, 22 and each outer reinforcing member 25, 26
Since the soil discharging plate 6 and each cylinder mounting bracket 22 are integrally welded to each other, it is possible to obtain high strength with the same plate thickness as compared with the lower reinforcing member 8 of the prior art.

Further, by previously welding and assembling the pair of cylinder mounting brackets 22, 22 and the central reinforcing member 24, it becomes possible to form the pin insertion hole 22B before welding to the soil discharging plate 6, so that workability is improved. Can be improved.

In the embodiment, since the strength is improved, the upper reinforcing plate 7 in the prior art is omitted to reduce the weight, but the upper reinforcing plate 7 may be provided to further increase the strength.

[Effect of device]

As described in detail above, the present invention directly attaches the mounting brackets of the lifting cylinder to the rear surface of the earth discharging plate, and the reinforcing plate is disposed between the mounting brackets and the central reinforcing member and the left side of each mounting bracket. ., The left and right stays are fixed to the left and right outer reinforcing members, respectively, so that the hydraulic pressure of the lifting cylinder is increased. Can be transmitted directly to the earth-discharging plate via each mounting bracket, and the impact force applied to the earth-discharging plate can be transmitted to the lifting cylinder side via each mounting bracket. It is possible to prevent the deformation of the reinforcing plate and improve the durability of the reinforcing plate. Further, when it is not necessary to particularly improve the strength of the reinforcing plate, it is possible to reduce the weight and the material cost. can do Further, by dividing the reinforcing plate into three members, that is, the central reinforcing member and the pair of outer reinforcing members, the length dimension of each reinforcing member can be shortened. It is possible to manufacture a reinforcing plate having a high cost, and it is possible to reduce the processing cost to reduce the cost and improve the assembling property at the time of assembly. Moreover, by preliminarily welding and assembling each mounting bracket and the central reinforcing member, it is possible to form a pin insertion hole in each mounting bracket before welding to the earth discharging plate, thereby improving workability. Can be planned.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a top view of an earth-discharging plate device provided on a hydraulic excavator, and FIG.
An II-II arrow direction enlarged sectional view in the figure, FIGS. 3 to 5 show one prior art, and FIG. FIG. 4 is an enlarged top view of the soil discharge plate device shown in FIG. 3, and FIG. 5 is VV in FIG.
Sectional views in the direction of the arrows, FIG. 6 and FIG. 7 relate to another conventional technique. FIG. 6 is an enlarged top view of the essential parts of the earth discharging plate device, and FIG. 7 is an arrow VII-VII in FIG. FIG. 6 ... Soil discharge plate, 6A ... Soil discharge surface, 6B ... Rear surface, 21 ... Elevating cylinder, 23 ... Reinforcement plate, 24,25,26 ... Reinforcement member.

Claims (1)

[Scope of utility model registration request] 1. An upper part of a working machine body via left and right stays,
An earth-discharging plate which is provided so as to be able to move up and down and has a front surface serving as an earth-discharging surface, a reinforcing plate fixed to the rear surface of the earth-discharging plate along the longitudinal direction, and the earth-discharging plate through a pair of mounting brackets. An elevating cylinder arranged between the earth plate and the working machine body, each mounting bracket of the elevating cylinder is directly fixed to the rear surface of the earth discharging plate, and the reinforcing plate is provided between the mounting brackets. 3 of a central reinforcing member arranged on the left side and a pair of outer reinforcing members arranged on the left and right sides of the respective mounting brackets.
The member is divided into members, the reinforcing members are integrally fixed to the rear surface of the earth discharging plate with the mounting brackets, and the left and right stays are fixed to the left and right outer reinforcing members, respectively. Earth plate device.